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No power to heater display has me stumped

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4 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHNo power to heater display has me stumped

Leading reported evidence

Check relevant fuses, switched other relays

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

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Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that performed work without a confirmed outcome: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Performed · outcome unconfirmed · Original poster
Checked the relevant fuses, switched other relays for the relays that are involved, #9 and #18.
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No power to heater display has me stumped

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Leading evidence: 'Check relevant fuses, switched other relays' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check relevant fuses, switched other relays' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

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1 matching discussions · 4 captured posts examined · 0 partial discussions

Compare 2 other evidence results

Clean "zebra" strips

Suggestion or failed attempt

No successful repair reported for this finding.

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Reported fixes: 0
Unsuccessful attempts: 1
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Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

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Suggestion
You could try disassembling the unit and cleaning the the "zebra" strips that connect the LCD display to the electronics inside.
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No power to heater display has me stumped

Replace brake booster

Suggestion or failed attempt

No successful repair reported for this finding.

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Reported fixes: 0
Unsuccessful attempts: 1
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Discussions that contain suggestions: 1

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Suggestion · Original poster
Last thing I worked on was replacing the brake booster.
Original post Read captured discussion
No power to heater display has me stumped

Frequently discussed actions (3)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Check relevant fuses, switched other relays

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that performed work without a confirmed outcome: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Performed · outcome unconfirmed · Original poster
Checked the relevant fuses, switched other relays for the relays that are involved, #9 and #18.
Original post Read captured discussion
No power to heater display has me stumped

Clean "zebra" strips

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion
You could try disassembling the unit and cleaning the the "zebra" strips that connect the LCD display to the electronics inside.
Original post Read captured discussion
No power to heater display has me stumped

Replace brake booster

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster
Last thing I worked on was replacing the brake booster.
Original post Read captured discussion
No power to heater display has me stumped

Coverage and how to read this overview

Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.

4 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

Rennlist: 1 discussions

0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.

1 acknowledgements have no verified action link; they do not establish a repair result.

Outcome without a verified action link
Since I have another 2000 Boxster hanging around in the driveway I pulled its display/control unit and plugged in the supposedly problematic one and it worked fine in the other car.
Original post Read captured discussion
No unique explicit quoted action; no causal link assigned

Generation: 20261026T161109Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

(This is a cross post from 986forum, 986 and 996 heater controls are the same) Yesterday my heater display was blank when I started the car (2000 Boxster base 5-speed). Last thing I worked on was replacing the brake booster. When completed, the day before yesterday I went for a short test drive and did not notice if the heater display was working... it was working before the booster change. I don't see what the one could have to do with the other, and I am not sure of the timing of the problem. What I have done so far... Checked the relevant fuses, switched other relays for the relays that are involved, #9 and #18. I pulled the display/control unit out of the dash and checked that there was 12V on pin #9 and ground on pin #15 of connector D. For me this tends to confirm that the fuses and relays are OK. Since I have another 2000 Boxster hanging around in the driveway I pulled its display/control unit and plugged in the supposedly problematic one and it worked fine in the other car. So where do I go from here?

POST 2Original post

Does the unit otherwise function? (i.e. you can turn on the heat, fan, etc.?) If so, it could be the contacts to the LCD display. You could try disassembling the unit and cleaning the the "zebra" strips that connect the LCD display to the electronics inside. It's quite a pain to do, though. Search for Climate Control LCD replacement and you might find a DIY.

POST 3 / ORIGINAL POSTEROriginal post

Quotes source post: 19410623

No, nothing works, so it is not just the display. My original post was not clear on that.

POST 4 / ORIGINAL POSTEROriginal post

I found the problem! A bad fuse... E7. I had already checked it and it looked fine and passed the continuity test. When I rechecked it I noticed that the contacts were a bit crooked so I switched in another and voila the HVAC works. So it was not related to the brake booster replacement. Coincidences do happen.

This is a source reference. Confirm exact model applicability in the original material.